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default gateway
A default gateway in computer networking is the node that is assumed to know how to forward packets on to other networks. Typically in a TCP/IP network, nodes such as servers, workstations and network devices each have a defined default route setting, (pointing to the default gateway), defining where to send packets for IP addresses for which they can determine no specific route. The gateway is by definition a router.
==Overview==
In a home or small office environment, the device, such as a DSL router or cable router that connects the local network to the Internet will act as the default gateway for all network devices.
In enterprise systems, there may be many internal network segments. A device wishing to communicate with an Internet address for example, will forward the packet to the default gateway for their segment. This in turn may pass the packet to a series of further default gateways before it leaves the enterprise. In such a situation, each gateway node may also act as a proxy server and a firewall.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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